I dont understand how weight becomes mass.Both these terms are different weight is the force exerted by the planet on a thing while mass is the amount of matter present in it.Mass is constant everywhere while weight isnt

Weight and mass are different... dictionary.com doesn't always tell the truth. Mass is the measure of how much matter an object contains. It is measured with a balance and uses grams (g) as its units. Weight is the measure of gravity pulling on an object. It is measured with a scale and uses Newtons (N) as its units. Science teachers always teach students the differences between the two.

I gather that originally yhe puzzle had "weight" being destroyed, and this was changed to "mass" because mass and wweight aren't the same. Well they're not, but that wouldn't spoil the puzzle. OTOH, I find the word "mass" makes this puzzle too easy. It would be better to use "gram" which is a unit of mass. Do not use "pound", that's a unit of weight.

There are many unscientific comments here. Firstly, mass is not constant. If a body is accelerated within a frame of reference, it exhibits an apparent increases in mass. Secondly, weight is the force exerted by gravity on a given mass. Mass is usually measured with reference to its weight; for example a mass of 2 kg "weighs" 2 kg on Earth but would have a different weight on the moon. A scientist might determine that the gravitational force on a mass of 2 kg is 2 x 9.8 = 19.6 Newtons but your average consumer would ask for 2 kg of potatoes and expect that the scale would read 2 Kg not 19.6 Newtons. Outside of the physics lab and the mars explorer pretty much mass = weight
Good teaser BTW

I'm pretty sure, in the context of a REBUS TEASER -- in which EVERYTHING is just symbolism -- weight and mass are close enough to be synonyms. Lol! Now this teaser has been made worse than it's original state. I like it still though!